Involvement:Expert (understands the inner workings) - Ownership:1 week to 1 month
This is the simplest and most efficient way to switch something on via change of temperature. The device requires no power to operate, so is energy efficient and can be setup in a very short time.
Contacts may not be sufficiently well insulated to guarantee safety so I'd be mounting the device in a ventilated plastic box to make sure people, pets, plants don't potentially come into contact with any voltages.
Use of a SSR (Solid state relay), is a good idea if you want to switch anything large (like an air conditioner) on and off.
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